At an age when most players are declining, Serena Williams is still the most dominant force in women’s tennis.
You can’t be that good for that long without an insane competitive streak, and she has one.
She has destroyed racquets, fought with young players, and played through gross injuries on her way to the top.
This feature is a part of our Most Dominant Athletes series.
She told a line judge, 'I'd take this ball and shove it down your f***ing throat' at the 2009 US Open.
(image url='http://static.businessinsider.com/image/51a8c3f36bb3f71f5300000e/serena-williams-breaks-racket.gif' alt='Serena williams breaks racket' link='lightbox' size='secondary' align='right' clear='true')
She allegedly unfollowed 20-year-old Sloane Stephens on Twitter after she beat her at the Aussie Open.
She flipped out on a US Open official and called her a 'hater' after she penalised her for grunting.
She refuses to play at Indian Wells (one of the most popular events on tour), because fans booed her sister there in 2001.
Even though she had won 19 matches in a row, she wrecked a racquet when she lost to Angelique Kerber in 2012.
(image url='http://static.businessinsider.com/image/51a8c79e6bb3f7d25900001c/serena-williams-chucks-racquet.gif' alt='Serena williams chucks racquet' link='lightbox' size='secondary' align='right' clear='true')
She had an emotional breakdown and started crying at the 2012 French Open, when it looked like her game might never recover.
She reportedly holds a grudge against Justine Henin because she called a timeout in the middle of Serena's serve 10 years ago.
She could have retired after a life-threatening pulmonary embolism in 2011, but she fought her way back.
NOW WATCH: Briefing videos
Business Insider Emails & Alerts
Site highlights each day to your inbox.